peb20534 Infineon Technologies Corporation, peb20534 Datasheet - Page 36

• Manufacturer Part Number: peb20534
• Description: Dma Supported Serial Communication Controller With 4 Channels
• Manufacturer: Infineon Technologies Corporation

Table 1
Pin No.
68
188
189
Data Sheet
Note: PCI control signals (type s/t/s) always require pull-up resistors. For the system
Note: The function of PCI Bus Interface signals is the same in DEMUX mode where
Additional DEMUX Interface Control Signals
dependent pull-up recommendation please refer to PCI Specification Revision
2.1 chapter 4.3.3
the DSCC4 is operated in a non-PCI bus environment. All recommendations and
signal characteristics also apply in DEMUX mode.
Signal PAR is not generated and remains ’0’ in DEMUX mode.
In DEMUX mode signal IDSEL is a chipselect for the PCI Configuration Space
(no bus commands exists in DEMUX mode to address Configuration Space
access in addition to IDSEL)
Symbol
INTA
DEMUX
W/R
PCI Bus Interface(DEMUX Interface) (cont’d)
Input (I)
Output (O)
o/d
I
I/O
Function
Interrupt Request
When an interrupt status is active and
unmasked, the DSCC4 activates this open-
drain output. Examples of interrupt sources
are transmission/reception error, completion
of transmit or receive packets etc. The DSCC4
deactivates INTA when the interrupt status is
acknowledged via an appropriate action (e.g.,
specific register write) and no other unmasked
interrupt statuses are active.
INTA is activated/ deactivated asynchronous
to the CLK.
PCI/De-multiplexed Mode Select
DEMUX = ’0’ selects normal PCI operation.
DEMUX = ’1’ selects operation in de-
multiplexed (DEMUX) mode.
(Pull-Up/Down resistors or direct connection
to V
Write/Read Control
This signal distinguishes between write and
read operations in the De-multiplexed mode.
It is tristate when the DSCC4 is in PCI mode.
A Pull-Up resistor to V
for PCI operation mode (DEMUX = V
36
SS
/V
DD3
possible)
DD3
is recommended
Pin Descriptions
PEB 20534
PEF 20534
2000-05-30
SS
).